34 years old and TTC

I have two children already. And have recently remarried. Husband has no kids and we are TTC. I am 10dpo. Last week I had what seemed to be pregnancy symptoms; lightheaded, dizzy, cramps every day. I had a streak of red when I wiped on June 7. Period isn't due until 16/17. Took a test and got a BFN this morning. Could I still be pregnant? Or is it all in my head? Thanks ladies